Merlin 3070 Service And Maintenance Manual page 190

Test two or three times. If the "DIAG" message does not
appear, replace the Diagnostics Module.
D.
Once diagnostics are running with the Processor and
Diagnostics Modules installed, set the On/Off switch to Off
and reinsert the Feature Module. Set the On/Off switch to
On. Set the Normal/Test switch to Normal then to Test. If
the "DIAG" message does not appear, replace the Feature
Module.
E. When diagnostics are running with the Power, Processor,
Feature, and Diagnostics Modules in place, go to step 6.
6. Test Line, Voice Terminal, and other modules as follows:
A. With only the Power, Processor, Feature, and Diagnostics
Modules in place, run several sweeps of tests. When the
"*MSG" message appears, press the Next button to
continue testing. If any other messages appear, refer to
the explanation of the message in the "Diagnostic Display
Messages" section.
B. Check for bent or broken backplane pins in the empty slots.
Reinsert single modules, in the order listed below, and
C.
restart the sweep of test after installing each module. (To
restart the sweep press Next, then Detail.) If diagnostics will
not run after a particular module is installed, that module is
suspect. Reinsert the modules in this order:
slot 7 (Line Module)
slot 9 (Voice Terminal or Basic Telephone Module)
slot 8 (Line, Voice Terminal, or Basic Telephone
Module)
slot 10 (Line, Voice Terminal, or Basic Telephone
Module)
slot 11 (Line, Voice Terminal, or Basic Telephone
Module)
any other module.
D. If you are using the Diagnostics Module alone, go back to
step 2, page 5.
If you are using a data terminal, go back to step 3, page 7.
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